"So in this example, if you have Multicore enhancement enabled (which is an ASUS/MSI/ASRock/Gigabyte default), all cores will clock at higher turbo frequencies. Also, they'll be able to do that for a longer time, e.g. the Intel reference could be 30 seconds for max two cores at 4.8 GHz, whereas this enhancement could apply all six cores at 4.8 for an indefinite time. "
https://www.guru3d.com/articles-pages/intel-core-i9-9900k-processor-review,7.html
"Enabling multi-core enhancement means that the CPU ignores the Intel spec, instead locking all-core Turbo to the single-core Turbo speeds"
https://www.gamersnexus.net/guides/3077-explaining-coffee-lake-turbo-8700k-8600k